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Bedding dipping steeply and striking parallel to a tunnel axis is unfavourable because

  • A.the bedding prevents any groundwater from entering
  • B.one wall is undercut while the other is buttressed
  • C.the rock ahead of the face cannot be probed at all
  • D.the tunnel must then be driven entirely by hand methods

Answer: B

Beds dipping into one wall support it while those dipping out of the other let slabs slide into the excavation, so the two sides behave quite differently. Support must then be designed asymmetrically for the same tunnel.

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